While a Pokémon is making an uproar, if a sleeping Pokémon that does not have Soundproof would make a move, it is woken up immediately before using its move. Additionally, at the end of each turn during the uproar (including the turn the user calms down), any sleeping Pokémon on the field that do not have Soundproof are woken up. (Even if the user of Uproar has the Ability Mold Breaker, Pokémon with Soundproof can still be put to sleep and are not woken up by the uproar.)

During an uproar, Yawn will fail when used on a Pokémon that does not have Soundproof, and Rest will fail if used by a Pokémon that does not have Soundproof. Even if the user of Uproar has the Ability Mold Breaker, Pokémon with Soundproof can still be affected by Yawn.

The Pokémon will not start an uproar if the move fails against a Ghost-type Pokémon, a protected Pokémon, or a Pokémon with the Ability Soundproof; however, once it is making an uproar, it will continue even if it fails in such cases.

In battles with multiple opponents, the user selects itself as the target, but hits an adjacent opponent that is selected at random upon each use of the move.

Generation V onward

When Uproar is initially used (i.e. when the user is not already making an uproar), any sleeping Pokémon on the field are woken up (even if they have the Ability Soundproof). This is now the only time Uproar wakes up Pokémon that are already asleep.

Pokémon with Soundproof can no longer fall asleep or use Rest during an uproar.

Yawn will now succeed during an uproar (even when used on a Pokémon that does not have Soundproof), but drowsiness cannot cause a Pokémon to fall asleep during an uproar.

If Uproar fails against a Ghost-type Pokémon, a protected Pokémon, or a Pokémon with the Ability Soundproof, Uproar and its effect will immediately end.

In Triple Battles, Uproar can wake up non-adjacent Pokémon, and prevent non-adjacent Pokémon from falling asleep.